<html>
<!-- $Id: //info.ravenbrook.com/project/ccc/master/tool/grid.html#1 $ -->
<script src='grid.js'>
</script>
<body>
<canvas id='html-canvas' width='500' height='500'>
</canvas>
<canvas id='polar-canvas' width='500' height='500'>
</canvas>
</body>
<script>
ipl()
</script>
</html>
